(AutoIt) Create PKCS7 Attached/Opaque Signature (S/MIME)

Create an S/MIME message with a PKCS7 attached/opaque signature.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

; This example requires the Chilkat API to have been previously unlocked.
; See Global Unlock Sample for sample code.

$oMime = ObjCreate("Chilkat.Mime")

; Load a certificate w/ private key for signing.
; There are many ways of getting a certificate object:
; from a pfx file, from .cer and private-key files, from the
; Windows registry-based certificate stores, etc.
; Load a PFX file into a certificate object.
$oCert = ObjCreate("Chilkat.Cert")
Local $sPfxFilepath = "pfxFiles/something.pfx"
Local $sPfxPassword = "secret"
Local $bSuccess = $oCert.LoadPfxFile($sPfxFilepath,$sPfxPassword)
If ($bSuccess = False) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

; Create a very simple MIME message to be signed:
$bSuccess = $oMime.AddHeaderField("Subject","This is a test")
$bSuccess = $oMime.AddHeaderField("MyCustomHeader","abc123")
$oMime.ContentType = "text/plain"
$oMime.SetBody "This is a plain-text body."

; Examine the MIME prior to signing:
ConsoleWrite("--- MIME prior to signing ---" & @CRLF)
ConsoleWrite($oMime.GetMime() & @CRLF)

; The MIME prior to signing looks like this:
; -------------------------------------------------------------------------------

; Subject: This is a test
; MyCustomHeader: abc123
; Content-Type: text/plain
; 
; This is a plain-text body.

; -------------------------------------------------------------------------------

; The default hash algorithm used in the signing process is "SHA1".
; To change it, set the SigningHashAlg property:
$oMime.SigningHashAlg = "SHA256"

; Convert the MIME to PKCS7 signed-data.
$bSuccess = $oMime.ConvertToSigned($oCert)
If ($bSuccess = False) Then
    ConsoleWrite($oMime.LastErrorText & @CRLF)
    Exit
EndIf

; Examine the signed MIME
ConsoleWrite("--- MIME converted to PKCS7 signed-data ---" & @CRLF)
ConsoleWrite($oMime.GetMime() & @CRLF)

; The MIME after signing looks like this:
; -------------------------------------------------------------------------------

; Subject: This is a test
; MyCustomHeader: abc123
; Content-Disposition: attachment; filename="smime.p7m"
; Content-Transfer-Encoding: base64
; Content-Type: application/x-pkcs7-mime;
;  name="smime.p7m"; smime-type="signed-data"
; 
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; 

; ------------------------------------------------------------------------------